Optical lithography implementation of a non-degenerate parametric amplifier based on two coupled Josephson junction arrays

We present the implementation of a parametric amplifier which consists of two identical, capacitively coupled Josephson junction array resonators, referred to as Dimer Josephson Junction Array Amplifier (DJJAA). In accordance to our theoretical model we observe non-degenerate amplification in excess of 20 dB, instantaneous bandwidth of approx. 10 MHz and dynamic range exceeding the single-photon regime. The field dependent critical current of the junctions, implemented in the shape of SQUIDs, allows for over 1 GHz frequency tunability. All structures are fabricated using standard two step optical lithography, making the DJJAA fabrication procedure easily accessible to a wide community.